Stephen Coffeen, 41, faces a second-degree murder charge, St. Petersburg police said. He is accused of killing his father, Robert Coffeen, whose body was found Friday afternoon in his home at 1560 53rd St. N.

Police arrived about 3:45 p.m. and he was arrested two hours later.

"We were actually called by the family," Detective Rodney Tower said Friday. "When they got here, they saw the body and called us."

Stephen Coffeen was at the home when police arrived, Tower said. He was taken into custody without a struggle, officials said.

The arrest report states that Stephen Coffeen told police he suffocated his father in self defense. No information was released about the motive. Officials spent Friday night interviewing Coffeen.

"We're doing what we can to sort through everything," Tower said.

Coffeen's address is listed as Davis, Calif., on a police report. His employer is West Yost Associates, an engineering consulting firm in Davis, according to the report.

A woman who answered a phone number at Coffeen's home in Davis said she had no comment. She did not identify herself.

He remained in Pinellas County Jail on a $100,000 bond Saturday.

His father's house, a pink one-story concrete building, had police tape surrounding it Saturday afternoon. A Pinellas County Sheriff's office crime scene investigation van and a St. Petersburg police cruiser were parked out front.